CN103711536A - Variable valve timing and direct-injection gasoline engine cam shaft - Google Patents
Variable valve timing and direct-injection gasoline engine cam shaft Download PDFInfo
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- CN103711536A CN103711536A CN201210373258.7A CN201210373258A CN103711536A CN 103711536 A CN103711536 A CN 103711536A CN 201210373258 A CN201210373258 A CN 201210373258A CN 103711536 A CN103711536 A CN 103711536A
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Abstract
A variable valve timing and direct-injection gasoline engine cam shaft comprises a variable valve timing oilway, three pairs of air change cams and a high-pressure oil pump drive cam. The variable valve timing oilway is arranged on the first section and the second section cam shaft journals close to the front end of the cam shaft and comprises a phase advance oilway and a phase lag oilway. The air change cams are arranged on the middle section of the cam shaft at certain intervals. The included angle among the air change cams evenly distributed is 120 degrees. The high-pressure oil pump drive cam is disposed at the rear end of the cam shaft, three tips are evenly disposed on the cam, and the width of the cam is larger than that of each aeration cam. The variable valve timing and direct-injection gasoline engine cam shaft is reasonable and simple in structure and convenient to machine, the problems that the arranging space of the cam shaft is insufficient and the structural strength of the cam shaft cannot be guaranteed are solved, large modification on key parts such as a cylinder head and a cylinder head cover is not needed, part universality is increased, and the cam shaft is quite applicable to small-displacement engines with compact structures.
Description
Technical field
The present invention relates to a kind of gasoline engine camshaft, relate in particular for Variable Valve Time and in-cylinder direct fuel-injection engine camshaft.
Background technique
Variable Valve Timing is by electronic control technology, to change unlatching and the close moment of valve, improves some speed stage intrinsic motivation intake efficiency, thereby improves engine torque and power.Direct injection technology is utilized rarefied gas combustion principle exactly, and high pressure gasoline is directly burnt in cylinder combustion with atomized spray, and high fuel pressure and cylinder pressure have guaranteed rarefied gas, will greatly improve Economy and the power character of motor.Engine development is wanted the above new technology of integrated use, camshaft need be arranged the oil circuit control of Variable Valve Time and the driving cam of high pressure oil pump, particularly, for the small displacement engine of compact type, the arrangement space deficiency of camshaft and structural strength are difficult to guarantee.
While designing Variable Valve Time oil circuit control on camshaft, for guaranteeing oil flow rate, oilhole can be done large or accelerate, but considers again the intensity of camshaft bearing journal, only have increase camshaft bearing journal, certainly will cause Camshaft Manufacturing Engineering complexity, difficulty in arrangement and weight to increase.
While designing high pressure oil pump driving cam on camshaft, be arranged in camshaft stage casing, will cause motor whole height to increase, motor general arrangement is limited.And for the motor of natural aspiration, the key components and partss such as cylinder head, valve mechanism cover need change, universal componentization reduces.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, propose a kind of Variable Valve Time and directly spray gasoline engine camshaft.
Concrete technological scheme of the present invention is:
A kind of steel camshaft structure is provided, is applicable to three cylinder engine, comprise some ventilation cams, axle journal, Variable Valve Time oil circuit control, high pressure oil pump cam.
The material that the present invention adopts is middle-carbon steel, and cam face only needs induction hardening, just can meet mechanical strength, without the complicated heat treatment process of the modified grade of carburizing.
Variable Valve Time oil cake arrange, at camshaft front end, comprises phase place in advance and stagnant latter two oil circuit.Wherein, be from camshaft front end around axle center, to be processed with several axial oilholes, connect by radial direction oil hole with first annular oil groove at second segment axle journal place; Phase place hysteresis oil circuit, be from cam front end from center processing bolt via hole vertically, connect by radial direction oil hole with second annular oil groove at axle journal place, excessively oily by the gap of bolt through-hole and bolt light rod.This kind of layout reduced machining of oil hole quantity, and structure &processes is simple, and guaranteed the integrity of processing and detection reference face, on subsequent fine processing and the impact of detection nothing, makes the structural design of camshaft more reasonable.
Totally three pairs, ventilation cam, is respectively the first cylinder cam, the second cylinder cam and the 3rd cylinder cam, in camshaft stage casing, is at intervals arranging, three pairs of ventilation cams become 120 ℃ of angles to be evenly arranged.
High pressure oil pump driving cam is arranged in camshaft rear end, and cam radially has 3 peach points, is evenly arranged, and the width of high pressure oil pump driving cam is slightly large compared with intake cam.
Near the cam journal at high pressure oil pump cam place, large compared with the axle journal of taking a breath between cam, be mainly the support strength that guarantees rear end cam of injection pump section.In addition, the variation of cylinder head is less, and the component such as valve mechanism cover can be general at same engine flat, and motor whole height has reduced, and is beneficial to General Layout Design.
Also have, the axle journal between the second cylinder cam and the 3rd cylinder cam is outer hexagonal structure, and the dish for camshaft when assembling turns and locates; And on six side's corner angle, be processed with a plane, tangent with cam journal cylindrical, and be processed with in the plane circular hole, as assembling leading mark.
The present invention is rational in infrastructure, simple, easy to process, and arrangement space deficiency and the structural strength that can solve camshaft are difficult to the problem guaranteeing.And do not need the key components and partss such as cylinder head, valve mechanism cover to do large change, improved universal component degree.The present invention is highly suitable for the small displacement engine of compact type.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Fig. 2 is Variable Valve Time oil channel structures of the present invention
Fig. 3 is oil pump driving cam structure of the present invention
Fig. 4 is hexagonal structure of the present invention
Embodiment
Below in conjunction with accompanying drawing, further illustrate structure of the present invention:
Camshaft as shown in Figure 1 comprises: first, second, third, fourth and fifth section camshaft bearing journal 1,2,4,5,7, ventilation cam 3, oil pump driving cam 6, outer hexagonal structure 8 and annular boss 9.
Wherein, first paragraph camshaft bearing journal 1 is at camshaft front end, during assembling and phase discriminator closely cooperate, the local oil circuit of camshaft front end is sealed.
After second segment camshaft bearing journal 2 is arranged in first paragraph camshaft bearing journal 1, be processed with the required annular oil groove of Variable Valve Time and radial direction oil hole, therefore axle journal radial dimension is larger, and is respectively equipped with annular boss 9 in axle journal both sides, spacing for camshaft axial float.
Totally 3 pairs, ventilation cam 3, at intervals, and becomes 120 ℃ of angles to be evenly arranged.
The 3rd section of camshaft bearing journal 4 is arranged between ventilation cam 3, and totally 3, size and width are identical.
Before the 4th section of camshaft bearing journal 5 is arranged in high pressure oil pump driving cam 6, axle journal width is larger.
High pressure oil pump driving cam 6 is arranged in camshaft rear end, and its width cam 3 of taking a breath is larger, and nose quantity has 3, also becomes 120 ℃ of angles to be evenly arranged.The 5th section of camshaft bearing journal 7 is arranged in tail end of camshaft, press-fiting for signal panel after processing.
If Fig. 2 is Variable Valve Time oil channel structures schematic diagram of the present invention, comprises phase place and shift to an earlier date oil circuit A and phase place hysteresis oil circuit B.Wherein, camshaft front end is processed with the first annular oil groove and 3 axial direct oilholes, connect, and axial direct oilhole is communicated with radial direction oil hole, the annular oil groove of camshaft bearing journal 2 by U-shaped oil groove, forms phase place and shifts to an earlier date oil circuit A.Camshaft front end center is processed with deep hole, is bolt through-hole, forms annular space with phase discriminator connecting bolt 10, and is communicated with another place's radial direction oil hole and second annular oil groove of camshaft bearing journal 2, forms phase place hysteresis oil circuit B.
If Fig. 3 is oil pump driving cam structural representation of the present invention, oil pump driving cam 6 is installed in oil pump base 11, by the rotation of oil pump driving cam 6, drives oil pump tappet 12 to pump, and impels high pressure oil pump 13 to produce high pressure oil.
If Fig. 4 is the structural representation of the outer hexagonal structure 8 of the present invention, be arranged on the axle journal between second, third cylinder cam machine shaping.On hexagonal structure 8, be provided with locating face 16 outside, totally two places, and relatively and parallel; On the corner angle of hexagonal structure 8, be processed with outside a plane 14, tangent with camshaft bearing journal cylindrical, and in plane 14, be processed with semicircle orifice 15, as assembling leading mark.
Claims (7)
1. Variable Valve Time and directly spray a gasoline engine camshaft, comprises Variable Valve Time oil circuit, ventilation cam and high pressure oil pump driving cam; It is characterized in that:
Described Variable Valve Time oil cake arrange, by the first paragraph and second segment camshaft bearing journal of camshaft front end, comprises phase place and shifts to an earlier date oil circuit and phase place hysteresis oil circuit; Wherein, phase place shifts to an earlier date oil circuit, is from camshaft front end around axle center, to be processed with several axial oilholes, connects by radial direction oil hole with first annular oil groove at second segment axle journal place; Phase place hysteresis oil circuit, be from cam front end from center processing bolt via hole vertically, connect by radial direction oil hole with second annular oil groove at second segment axle journal place, excessively oily by the gap of bolt through-hole and bolt light rod;
When the first paragraph camshaft bearing journal of described camshaft front end is assembling and the close-fitting position of phase discriminator;
Totally three pairs, described ventilation cam (3), at intervals arranges in camshaft stage casing, and three pairs of ventilation cams become 120 ℃ of angles to be evenly arranged, and are respectively the first cylinder cam, the second cylinder cam and the 3rd cylinder cam;
Described high pressure oil pump driving cam is arranged in camshaft rear end, has been evenly arranged three peach points on cam, and its width is greater than intake cam.
2. engine cam according to claim 1, is characterized in that: the second segment camshaft bearing journal both sides of camshaft front end are respectively equipped with annular boss.
3. engine cam according to claim 1, is characterized in that: the axial oil hole number that described phase place shifts to an earlier date oil circuit is three, is uniformly distributed.
4. according to the engine cam described in claim 1,2 or 3, it is characterized in that: large compared with the 3rd section of cam journal of taking a breath between cam near the 4th section of cam journal at high pressure oil pump cam place.
5. engine cam according to claim 3, is characterized in that: the axle journal between the second cylinder cam and the 3rd cylinder cam is outer hexagonal structure.
6. engine cam according to claim 5, is characterized in that: on six square shaft necks corner angle, be processed with a plane outside, and tangent with cam journal cylindrical, and be processed with circular hole in this plane, as assembling leading mark.
7. engine cam according to claim 4, is characterized in that: the material of described camshaft is middle-carbon steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210373258.7A CN103711536A (en) | 2012-09-29 | 2012-09-29 | Variable valve timing and direct-injection gasoline engine cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210373258.7A CN103711536A (en) | 2012-09-29 | 2012-09-29 | Variable valve timing and direct-injection gasoline engine cam shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103711536A true CN103711536A (en) | 2014-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210373258.7A Pending CN103711536A (en) | 2012-09-29 | 2012-09-29 | Variable valve timing and direct-injection gasoline engine cam shaft |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761997A (en) * | 2015-09-23 | 2017-05-31 | 斯太尔动力 | Assembling camshaft |
| CN111895905A (en) * | 2020-05-27 | 2020-11-06 | 中国计量大学 | Error compensation method for hexagonal axis straightness detection system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060042581A1 (en) * | 2004-08-31 | 2006-03-02 | Hitachi, Ltd. | Valve timing control apparatus and its assembling method |
| US20070193541A1 (en) * | 2006-02-21 | 2007-08-23 | Toyota Jidosha Kabushiki Kaisha | Valve system of V-type engine |
| CN101182793A (en) * | 2007-12-04 | 2008-05-21 | 奇瑞汽车有限公司 | VVT engine oil gallery |
| CN101737110A (en) * | 2009-12-15 | 2010-06-16 | 重庆大学 | Single overhead camshaft air inlet phase continuous variable mechanism of motorcycle engine |
-
2012
- 2012-09-29 CN CN201210373258.7A patent/CN103711536A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060042581A1 (en) * | 2004-08-31 | 2006-03-02 | Hitachi, Ltd. | Valve timing control apparatus and its assembling method |
| US20070193541A1 (en) * | 2006-02-21 | 2007-08-23 | Toyota Jidosha Kabushiki Kaisha | Valve system of V-type engine |
| CN101182793A (en) * | 2007-12-04 | 2008-05-21 | 奇瑞汽车有限公司 | VVT engine oil gallery |
| CN101737110A (en) * | 2009-12-15 | 2010-06-16 | 重庆大学 | Single overhead camshaft air inlet phase continuous variable mechanism of motorcycle engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761997A (en) * | 2015-09-23 | 2017-05-31 | 斯太尔动力 | Assembling camshaft |
| CN106761997B (en) * | 2015-09-23 | 2019-06-04 | 斯太尔动力 | Assemble camshaft |
| CN111895905A (en) * | 2020-05-27 | 2020-11-06 | 中国计量大学 | Error compensation method for hexagonal axis straightness detection system |
| CN111895905B (en) * | 2020-05-27 | 2022-04-19 | 中国计量大学 | Error compensation method for hexagonal axis straightness detection system |
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Application publication date: 20140409 |